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Code Pro
languagejava
titleProvisioning of datasource components
public class DatasourceComponentParameterResolver implements ParameterResolver {

    private final DatasourceSupport datasourceSupport;
    private final Object datasourceDefinition;

    public DatasourceComponentParameterResolver(DatasourceSupport datasourceSupport, Object datasourceDefinition) {
        this.datasourceSupport = datasourceSupport;
        this.datasourceDefinition = datasourceDefinition;
    }

    @Override
    public Object resolveParameter(ParameterInfo parameter) {
        boolean isDatasourceComponent = Stream.of(parameter.getParameterAnnotations()).anyMatch(DatasourceComponent.class::isInstance);
        if (isDatasourceComponent) {
            return datasourceSupport
                    .getDatasourceBundle(datasourceDefinition)
                    .lookup(parameter.getParameterType(), datasourceDefinition);
        }

        return UNRESOLVED;
    }
}


Questions:

  • It is pretty clear that DataProvider and PropertySet domain-specific implementaions are required. But what else?
  • (question) optional HierarchicalDataProvider and potentially additional Hierarchy support for parent resolution (not covered by HDP interface in Vaadin).
  • (question) utilities to "serialise"/"deserialise" items to and from URL fragments.
  • (question) utility to "describe" the items (for status purposes and such).

Databinding in Grids